6.5x47 & 260 Lapua brass trimming

Discussion in 'Big Stuff -- 6.5mm, 7mm, 30 Cal' started by chrisj, Feb 11, 2018.

  1. chrisj

    chrisj Silver $$ Contributor

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    Apr 24, 2005
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    Just taking a little informal poll on how often 6.5 x 47 and 260 Lapua brass needs trimming.
    Thanks for your input
     
  2. Prose

    Prose

    Joined:
    Apr 20, 2017
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    471
    My 260 brass does about 1 to 2 thou per firing so maybe once over the course of it's life (~20 firings)
     
  3. Cowtownup

    Cowtownup Silver $$ Contributor

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    Feb 19, 2015
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    I rarely trim my 260 brass but I don’t run it real hot either.
     
  4. buddy.223

    buddy.223

    Joined:
    Oct 22, 2015
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    i found my 47 brass actually shrank on first firing i shoot it 7 times then move it on never had to trim it
     
  5. MagnumManiac

    MagnumManiac

    Joined:
    Sep 23, 2014
    Messages:
    323
    I have 10 loads on 6.5x47 Lapua brass and haven’t trimmed yet.
    It’s similar to my 22-250AI, doesn’t require trimming as far as I can tell. Both are Lapua SR blue box.
    I also have some LR Winchester ww-super that I re-formed just get some loads started and haven’t had to trim either. Capacity is almost identical.

    Cheers.
    :)
     
  6. dstoenner

    dstoenner Silver $$ Contributor

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    Sep 29, 2015
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    I trim my brass after every firing. Brass doesn't stretch uniformly so case mouths get out of perpendicular to case axis. Which doesn't help seating. After the first firing the amount of case growth is small but you can tell that they get touched by the cutter because the mouth edge is shiny.

    Consistency is my goal to having low runout low ES/SD loads. This is just one step in the process.

    David
     
    Bc'z likes this.

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